Why don't you just get the 650L flywheel? Are they of different diameters?
You can get any dimension needle bearing made. There are catalogs you can get, but not from a motorcycle shop. Buy either Americn bearings or Japanese bearings. Don't buy Mylasian bearings. I don't have a source catalog, but I've seen them before.
You could also have a machine shop modify your XR600R flywheel to maybe accomodate the sprag clutch. You are talking a lot of money though.
It would actually be cheaper to buy a used 650L motor and just bolt it right up into your XR600R's frame.
beat ya to it. already have a 650L flywheel
asked the guy who was rewinding the 600 R stator and he said the entire 650l system was vastly different.
the 650L CDI has all these cutouts and needs DC power BEFPORE THE BIKE STARTS. The 600R however will start off kick and needs no DC. He said the starting voltage of the 650L was like 15 volts whereas with the 600R it was 90 volts.
however -the 650L flwyheel requires the 650L stator and as you know the wntire 650L electrical systme is different.
The 650L is a 3 phase massive stator and flwyheel - as you know flywheesl and stators are a pair.
I toyed with the idea of transplanting the entire 650L wiring system - however the 650L CDI is not better than the 600Rs.
I have to use the 600R flywheel. It is a better outcome. Much lighter and newer